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From the Wall Street Journal: China’s largest search engine on Sunday launched “Baidu Migrate,” a map that displays Lunar New Year travel routes in China and their popularity over a rolling eight-hour period. The Lunar New Year, or Spring Festival, holiday in China is considered the world’s largest seasonal migration of people as hundreds of millions of people flock home to reunite with their families.

Most of the popular routes in China are in line with recent migration patterns from rural to urban areas. The most popular route Monday afternoon, for example, was from Shanghai to the city of Chuzhou in eastern Anhui province, an inland province where many of China’s migrant workers come from. The next most popular route was from Beijing to Chengdu in central Sichuan province — another inland province known for its outflow of migrant workers.